Pump-plunger.



G. H. WRIGHTSONMJR. PUMP .PLUNGER. APPLICATION FILED MAY Is. 1914.

Patented Mar. 30, 1915.

I {WMZ/MM( To all whom t may con-cern.'

eration GrXlORC-rlll E. WRIGHTSON, JB., 0F ZBU'ITE, MONTANA.

PUMP-PLUNGER.

Be itknown that I, GEORGE H. WRIGHT- soN, Jr., of the city of Butte, inthe county of Silverbow, State of Montana, United ,States of America, have invented certain` Improvements in Pump-Plungers, of which the following 'is a specification.

This invention relates to an improved pump plunger which `is not necessarily 1n Contact with the inner surface of the pump.

In certain mines, the water pumped therefrom is strongly impregnated with a salt of copper, probably, copper sulfate; and the plungers of the pumps, if of iron, and particularly cast iron, or of brass, are attacked by the copper salt held in solution in the water, to such an extent as to rene/ler them unserviceable -inga few hours. Furthermore, the coating of copper deposited on iron or brass plungers is not a solid body, but 'a spongy material which as it accumulates on the plungers falls to the bottom. of the pump cylinders, and interferes with the proper working of the valves which control the passage of water to and from the pumps. The practice now in vogue when a pump -becomes impaired in operation from the cause before stated, is to remove the plunger and turn oft in a lathe, the damaged surface, and then replaie the r`plunger in the pump. But this expedient isa costly'one, and among the many disadvantages accruing from its employment, is its reduction. in transverse area which lessens the capacity of the pump. It has been proposed to construct the plungers of some metal, such for instance as copper, which is not acted upon by the copper sulfate, but the cost of such a metal is great enough to almost prohibit its use. i

With my present invention, I eifect the advantages of using copper, by an expedient hereinafter described.

In the further description of myI invention which follows, reference is made to the accompanying drawing forming a pa'rt hereof, and in which Figure l is a partly sectional side view of a pump plunger embodying my present invention; and Fig. 2 an underside view of the same. v f

Referring now 'to the drawing, l is a straight hollow cylinder of glass, glazed- Speeieati'on of Letters Patent.

portion ofthe pump plunger with which the copper sulfate comes into contact, having at one end thereof a polygonal recess 2 foi` a purpose hereinafter described.

3 is a rod which constitutes the core of the plunger. It can be'made of iron, brass or some other material which if not protected, would have its surface injured by contact with' the copper sulfate, and is provided with a head 4 adapted to fit in the recess `2, and at a point above the end of the cylinder 1 has a thread, and a nut 5 whichv when set up, draws the head tightly into the recess.

To prevent the copper sulfate passing Patented lit/liar. 30', 19115. applicati@ fuea may is, '1914. serial No. 839,030.

around the head 4c to the interior of the cylinder and into contact with the rod or coreB there is .interposed between the head and the cylinder, a joint-forming gasket 7 of say lead as that metal is not injured by glie copper sulfate, and is slightly compressi- The plunger constructed as described can be used for an indenite period without material deterioration taking place.

I am aware that it is not new in pumps for corrosive liquids, to construct the plungers of glass which is molded around a metallic rod having enlargements which are wholly embedded in the glass in the molding operation; but I am not aware that plungers comprising a hollow glass cylinder open from end to end, and a metallic rod which is inserted in 'the cylinder and clamped thereto by means of a head on the rod which bears against one end of the cylinder, and a nut which bears uponthel other, a joint-forming gasket being interposed between the head and the end of the-.cylinder to prevent passage of liquid to the interior of the cylinder to contact with the core, and

I therefore claim as my invention:

1. In a pump plunger for the purpose described, a vitreous cylinder having ari-inner diameter which is uniform "throughout its length except at one end where it isenlarged to form a recess, combined with a cylindricalv 'gasket which is interposed between the head and the cylinder to prevent the passage of liquid into the interior of the cylinder.

2. In a pump plunger for the purpose described, a hollow vitreous cylinder, combined with an actuating rod for the saine which is passed through the cylinder, heads on the rod, means whereby thesaid heads are drawn together and upon the ends of the cylinder, anda joint forming gasket 10 which is interposed between one of the heads and the adjacent end of the cylinder.

GEORGE H. WRIGHTSON, JR.

lVitnesses:

THos. J. DAVIS, JOHN N. HosmNG. 

